allows you to type in any frequency (within the 136-174MHz or 400-470MHz range, depending on your model). MR is for your saved presets.
Most users get stuck on three specific areas that the manual covers in a somewhat technical shorthand. Mastering these makes the radio your own: Weierwei Vev-v8 Manual
If you are looking at the manual—or trying to figure out the device without one—here is an exploration of why this radio is designed the way it is and the key "handshakes" you need to know to master it. The Philosophy of the Interface allows you to type in any frequency (within